Stuts2 使用DispatchAction做一个简单的计算器

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使用DispatchAction做一个简单的计算器

DispatchAction是Struts中Action中的一种，为一种动态Action，可以处理相同类型的方法

1.calculator.jsp(计算页面)

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<%@pagelanguage="java"pageEncoding="GB18030"%>
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<title>calculator.jsp</title>
<mce:scripttype="text/javascript"><!--
functionfun(obj)
{
varelement=document.getElementById("method");
element.value=obj;
alert(element.value);
form1.submit();
}
//--></mce:script>
</head>
<body>
<center>
<formaction="calculator.do"method="get"id="form1">
<inputtype="text"name="num1"/><br>
<inputtype="text"name="num2"/><br>
<inputtype="hidden"id="method"name="method">
<inputtype="button"name="add"value="加"onclick="fun('add')">
<inputtype="button"name="sub"value="减"onclick="fun('sub')">
<inputtype="button"name="mul"value="乘"onclick="fun('mul')">
<inputtype="button"name="div"value="除"onclick="fun('div')">
</form>
</center>
</body>
</html>

<%@ page language="java" pageEncoding="GB18030"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>calculator.jsp</title>
    <mce:script type="text/javascript"></mce:script>
  </head>
  
  <body>
    <center>
      <form action="calculator.do" method="get" id="form1">
          <input type="text" name="num1"/><br>
          <input type="text" name="num2"/><br>
          <input type="hidden" id="method" name="method">
          <input type="button" name="add" value="加" onclick="fun('add')">
          <input type="button" name="sub" value="减" onclick="fun('sub')">
          <input type="button" name="mul" value="乘" onclick="fun('mul')">
          <input type="button" name="div" value="除" onclick="fun('div')">
      </form>
    </center>
  </body>
</html>

2.CalculatorForm(传参，验证ActionFrom)

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packagecom.feng.struts.form;
importjavax.servlet.http.HttpServletRequest;
importorg.apache.struts.action.ActionErrors;
importorg.apache.struts.action.ActionForm;
importorg.apache.struts.action.ActionMapping;
importorg.apache.struts.action.ActionMessage;
publicclassCalculatorFormextendsActionForm{
privatedoublenum1;
privatedoublenum2;
privatedoubleresult;
publicdoublegetNum1(){
returnnum1;
}
publicvoidsetNum1(doublenum1){
this.num1=num1;
}
publicdoublegetNum2(){
returnnum2;
}
publicvoidsetNum2(doublenum2){
this.num2=num2;
}
publicdoublegetResult(){
returnresult;
}
publicvoidsetResult(doubleresult){
this.result=result;
}
publicActionErrorsvalidate(ActionMappingmapping,
HttpServletRequestrequest){
ActionErrorserrors=newActionErrors();
if("".equals(num1)||"".equals(num2)){
errors.add("num.null",newActionMessage("num.num"));
}
returnerrors;
}
publicvoidreset(ActionMappingmapping,HttpServletRequestrequest){
//TODOAuto-generatedmethodstub
}
}

package com.feng.struts.form;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

public class CalculatorForm extends ActionForm {
 private double num1;
 private double num2;
 private double result;

public double getNum1() {
  return num1;
 }

public void setNum1(double num1) {
  this.num1 = num1;
 }

public double getNum2() {
  return num2;
 }

public void setNum2(double num2) {
  this.num2 = num2;
 }

public double getResult() {
  return result;
 }

public void setResult(double result) {
  this.result = result;
 }

public ActionErrors validate(ActionMapping mapping,
   HttpServletRequest request) {
  ActionErrors errors = new ActionErrors();
  if ("".equals(num1) || "".equals(num2)) {
   errors.add("num.null", new ActionMessage("num.num"));
  }
  return errors;
 }

public void reset(ActionMapping mapping, HttpServletRequest request) {
  // TODO Auto-generated method stub
 }
}

3.CalculatorAction(处理类DispatchAction)

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packagecom.feng.struts.action;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importorg.apache.struts.action.ActionErrors;
importorg.apache.struts.action.ActionForm;
importorg.apache.struts.action.ActionForward;
importorg.apache.struts.action.ActionMapping;
importorg.apache.struts.action.ActionMessage;
importorg.apache.struts.action.ActionMessages;
importorg.apache.struts.actions.DispatchAction;
importcom.feng.struts.form.CalculatorForm;
publicclassCalculatorActionextendsDispatchAction{
publicActionForwardadd(ActionMappingmapping,ActionFormform,
HttpServletRequestrequest,HttpServletResponseresponse){
CalculatorFormcalculatorForm=(CalculatorForm)form;
calculatorForm.setResult(calculatorForm.getNum1()
+calculatorForm.getNum2());
returnmapping.findForward("ok");
}
publicActionForwardsub(ActionMappingmapping,ActionFormform,
HttpServletRequestrequest,HttpServletResponseresponse){
CalculatorFormcalculatorForm=(CalculatorForm)form;
calculatorForm.setResult(calculatorForm.getNum1()
-calculatorForm.getNum2());
returnmapping.findForward("ok");
}
publicActionForwardmul(ActionMappingmapping,ActionFormform,
HttpServletRequestrequest,HttpServletResponseresponse){
CalculatorFormcalculatorForm=(CalculatorForm)form;
calculatorForm.setResult(calculatorForm.getNum1()
*calculatorForm.getNum2());
returnmapping.findForward("ok");
}
publicActionForwarddiv(ActionMappingmapping,ActionFormform,
HttpServletRequestrequest,HttpServletResponseresponse){
CalculatorFormcalculatorForm=(CalculatorForm)form;
if(calculatorForm.getNum2()==0){
ActionErrorserrors=newActionErrors();
//errors.add("num",newActionMessage("num.zero"));
//super.saveErrors(request,errors);
ActionMessagesmessage=newActionMessages();
message.add("d",newActionMessage("num.zero"));
super.saveErrors(request,message);
returnmapping.findForward("no");
}else{
calculatorForm.setResult(calculatorForm.getNum1()
/calculatorForm.getNum2());
returnmapping.findForward("ok");
}
}
}

package com.feng.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.actions.DispatchAction;

import com.feng.struts.form.CalculatorForm;

public class CalculatorAction extends DispatchAction {

public ActionForward add(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  CalculatorForm calculatorForm = (CalculatorForm) form;
  calculatorForm.setResult(calculatorForm.getNum1()
    + calculatorForm.getNum2());
  return mapping.findForward("ok");
 }

public ActionForward sub(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  CalculatorForm calculatorForm = (CalculatorForm) form;
  calculatorForm.setResult(calculatorForm.getNum1()
    - calculatorForm.getNum2());
  return mapping.findForward("ok");
 }

public ActionForward mul(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  CalculatorForm calculatorForm = (CalculatorForm) form;
  calculatorForm.setResult(calculatorForm.getNum1()
    * calculatorForm.getNum2());
  return mapping.findForward("ok");
 }

public ActionForward div(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  CalculatorForm calculatorForm = (CalculatorForm) form;
  if (calculatorForm.getNum2() == 0) {
   ActionErrors errors=new ActionErrors();
//   errors.add("num", new ActionMessage("num.zero"));
//   super.saveErrors(request, errors);
   ActionMessages message=new ActionMessages();
   message.add("d", new ActionMessage("num.zero"));
   super.saveErrors(request, message);
   return mapping.findForward("no");
  } else {
   calculatorForm.setResult(calculatorForm.getNum1()
     / calculatorForm.getNum2());
   return mapping.findForward("ok");
  }
 }
}

4.ApplicationResources.properties(资源文件，显示错误信息)

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num.null=/u6570/u5B57/u4E0D/u80FD/u4E3A/u7A7A/!/!/!
num.zero=/u6570/u5B57/u4E0D/u80FD/u4E3A/u96F6/!/!/!

5.struts-config.xml(配置文件)

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<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEstruts-configPUBLIC"-//ApacheSoftwareFoundation//DTDStrutsConfiguration1.2//EN""http://struts.apache.org/dtds/struts-config_1_2.dtd">
<struts-config>
<data-sources/>
<form-beans>
<form-beanname="calculatorForm"type="com.feng.struts.form.CalculatorForm"/>
</form-beans>
<global-exceptions/>
<global-forwards/>
<action-mappings>
<action
attribute="calculatorForm"
input="/form/calculator.jsp"
name="calculatorForm"
parameter="method"
path="/calculator"
scope="request"
type="com.feng.struts.action.CalculatorAction">
<forwardname="ok"path="/result.jsp"></forward>
<forwardname="no"path="/error.jsp"></forward>
</action>
</action-mappings>
<message-resourcesparameter="com.feng.struts.ApplicationResources"/>
</struts-config>